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로타리 압축기의 진동저감을 위한 영구자석 동기전동기의 토크제어
조관열 忠州大學校 2007 한국교통대학교 논문집 Vol.42 No.-
The single piston rotary compressor with PM synchronous motor is generally applied to air-conditioners due to its high efficiency and low cost. The single piston rotary compressor is, however, suffered by low speed operation due to its large mechanical vibration at low speeds, whereas the low speed operation of the compressor is highly required for high efficient operation in air-conditioner. The mechanical vibration of the single piston rotary compressor is caused by large pulsating torque during one mechanical rotation of the piston. In this paper, the torque control with compensating pulsating load torque is presented. The load torque is estimated by the load torque observer and corresponding currents for pulsating load torque are compensated to the current reference. The simulation results show that the proposed algorithm reduces the speed ripples of a PM synchronous motor at low speeds.
조관열 忠州大學校 2011 한국교통대학교 논문집 Vol.46 No.-
In this paper, power factor correction circuit and control algorithm to reduce the subharmonics of the source current of the single phase AC/DC power supply is investigated. The dc link voltage control and power factor control with PWM duty compensation is presented. The compensated duty is derived from the DC link voltage and the rectified source voltage. It was verified by the simulation that the THD of the source current is reduced compared to the conventional PFC control by adding the feed-forward compensating duty to the current controller.
Sensorless Control for a PM Synchronous Motor in a Single Piston Rotary Compressor
Cho Kwan-Yuhl The Korean Institute of Power Electronics 2006 JOURNAL OF POWER ELECTRONICS Vol.6 No.1
A sensorless control for an IPM (Interior Permanent Magnet) synchronous motor in a single piston rotary compressor is presented in this study. The rotor position is estimated from the d-axis and q-axis current errors between the real system and a motor model of the position estimator. The torque pulsation of the single piston rotary compressor is compensated to reduce speed ripples, as well as, mechanical noise and vibration. The proposed sensorless drive enables the compressor to operate at a lower speed which increases energy savings and reduces mechanical noise. It also gives high speed operations by a flux weakening control for rapid air-cooling and heating of the heat pump air-conditioners.
CURRENT CONTROL FOR A PERMANENT MAGNET SYNCHRONOUS MOTOR UNDER PARAMETER VARIATION
Kwan-Yuhl Cho,Se-Kyo Chung,Myung-Joong Youn 전력전자학회 1992 ICPE(ISPE)논문집 Vol.1992 No.4
A predictive current control which is insensitive to the uncertainties and the parameter variations of a permanent magnet(PM) synchronous motor is presented. The uncertainties in a PM synchronous motor include the back emf harmonics and the inexact estimation of motor parameters. The control input voltage consists of the linear part and the nonlinear part. The linear part generates the required nominal voltage and the nonlinear part compensates the variation in the required voltage from the nominal value due to the parameter variations and the uncertainties. The current errors at each sampling instants are bounded to a certain small value given by the maximum magnitudes of the uncertainties and the parameter variations.<br/>
Kwan-Yuhl Cho,Yong-Kyun Lee,Hyungsoo Mok,Hag-Wone Kim,Byoung-Ho Jun,Younghoon Cho 전력전자학회 2010 JOURNAL OF POWER ELECTRONICS Vol.10 No.6
MDPS (motor driven power steering) systems have been widely used in vehicles due to their improved fuel efficiency and steering performance when compared to conventional hydraulic steering. However, the reduction of torque ripples and material cost are important issues. A low resolution position sensor for MDPS is one of the candidates for reducing the material costs. However, it may increases the torque ripple due to the current harmonics caused by low resolution encoder signals. In this paper, the torque ripple caused by the quantized rotor position of the low resolution encoder is analyzed. To reduce the torque ripples caused by the quantization of the encoder signals, the rotor position and the speed are estimated by measuring the frequency of the encoder signals. In addition, the compensating q-axis current is added to the current command so that the 6th order torque harmonic is attenuated. The reduction of torque ripples by applying the estimated rotor position and the compensated q-axis current is verified through experimental results.
Cho, Kwan-Yuhl,Lee, Yong-Kyun,Mok, Hyung-Soo,Kim, Hag-Wone,Jun, Byoung-Ho,Cho, Young-Hoon The Korean Institute of Power Electronics 2010 JOURNAL OF POWER ELECTRONICS Vol.10 No.6
MDPS (motor driven power steering) systems have been widely used in vehicles due to their improved fuel efficiency and steering performance when compared to conventional hydraulic steering. However, the reduction of torque ripples and material cost are important issues. A low resolution position sensor for MDPS is one of the candidates for reducing the material costs. However, it may increases the torque ripple due to the current harmonics caused by low resolution encoder signals. In this paper, the torque ripple caused by the quantized rotor position of the low resolution encoder is analyzed. To reduce the torque ripples caused by the quantization of the encoder signals, the rotor position and the speed are estimated by measuring the frequency of the encoder signals. In addition, the compensating q-axis current is added to the current command so that the 6th order torque harmonic is attenuated. The reduction of torque ripples by applying the estimated rotor position and the compensated q-axis current is verified through experimental results.
Sensorless Control for a PM Synchronous Motor in a Single Piston Rotary Compressor
Kwan-Yuhl Cho 전력전자학회 2006 JOURNAL OF POWER ELECTRONICS Vol.6 No.1
A sensorless control for an IPM (Interior Permanent Magnet) synchronous motor in a single piston rotary compressor is presented in this study. The rotor position is estimated from the d-axis and q-axis current errors between the real system and a motor model of the position estimator. The torque pulsation of the single piston rotary compressor is compensated to reduce speed ripples, as well as, mechanical noise and vibration. The proposed sensorless drive enables the compressor to operate at a lower speed which increases energy savings and reduces mechanical noise. It also gives high speed operations by a flux weakening control for rapid air-cooling and heating of the heat pump air-conditioners.
조관열(Cho, Kwan-Yuhl),김학원(Kim, Hag-Wone),조영훈(Cho, Young-Hoon) 한국산학기술학회 2011 한국산학기술학회논문지 Vol.12 No.9
The Electric Power Steering (EPS) has been applied to the vehicles due to its better fuel efficiency, better steering feel, and the compact volume compared to the hydraulic power steering. The brushed PM (Permanent Magnet) DC motors had been adopted in most of the EPS systems until several years ago due to its easy control and a simple hardware configuration of the power converter, but nowadays the BLAC (Brushless AC) motor is becoming more popular for the EPS system because of its high efficiency and long lifetime. This paper reviews the configuration of the EPS system and the BLAC motor and drive technologies based on the papers published recently. The torque ripple reduction for steering feel and the fault detection algorithms for safety are also reviewed.
HEV용 영구자석 동기전동기의 상수변동 시 최대토크 운전
조관열(Cho, Kwan-Yuhl) 한국산학기술학회 2011 한국산학기술학회논문지 Vol.12 No.11
본 논문에서는 HEV용 영구자석 매립형 동기전동기의 단위전류 당 최대토크 운전을 위한 dq 전류 궤적에 대하여 고찰하였다. 전동기 상수로부터의 단위전류 당 최대토크 운전을 위한 dq 전류를 해석하고, 이를 바탕으로 영 구자석의 자속 및 dq 인덕턴스 등의 전동기 상수가 변할 경우 단위전류 당 최대토크 운전점의 변화를 고찰하였다. 또 한 단위전류 당 최대토크 제어를 위한 dq 전류의 궤적을 실험을 통하여 검증하였다. This paper investigates the dq current trajectory for maximum torque per ampere(MTPA) operation of an interior PM synchronous motor for HEV(Hybrid Electric Vehicle). Based on the dq current trajectory for the MTPA operation derived from the motor parameters, the change of the MTPA operating point for the variation of the motor parameters including the magnet flux and the dq inductances is considered. The dq current trajectory for MTPA operation is verified through the experiment.